public ReadOnlyObservableCollection<Element> Elements {get;}

//Find an element on a layout.

// Reference a layout project item by name
LayoutProjectItem layoutItem = Project.Current.GetItems<LayoutProjectItem>().FirstOrDefault(item => item.Name.Equals("MyLayout"));
if (layoutItem != null)
{
  QueuedTask.Run(() =>
  {
    // Reference and load the layout associated with the layout item
    Layout mylayout = layoutItem.GetLayout();
    if (mylayout != null)
    {
      //Find a single specific element
      Element rect = mylayout.FindElement("Rectangle") as Element;

      //Or use the Elements collection
      Element rect2 = mylayout.Elements.FirstOrDefault(item => item.Name.Equals("Rectangle"));
    }
  });
}